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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control - EMTC >> Diagnostic Routine(S) >> Diagnostic Routine Q >> Pinpoint Test

Pinpoint Test

  1. CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR RESISTANCE
    1. Ignition OFF.
    2. Disconnect: In-Vehicle Temperature and Humidity Sensor.
    3. Carry out the in-vehicle temperature and humidity sensor component test, REFER to In-Vehicle Temperature Sensor .

      Does the in-vehicle temperature and humidity sensor test OK? 

  2. CHECK THE HVAC MODULE OUTPUT VOLTAGE
    1. Ignition ON.
    2. Measure:
      In-Vehicle Temperature and Humidity Sensor In-Vehicle Temperature and Humidity Sensor
      G08033677
      G08033677
      C2247 C2247
      Pin Circuit Measurement / Action Pin Circuit
      2 VH414 (GN/BU)
      G08033411
      		 5 RH111 (GY/BU)

      Is the voltage between 4.7 and 5.1 volts? 

      • Yes:  INSTALL a new in-vehicle temperature and humidity sensor. REFER to In-Vehicle Temperature Sensor . TEST the system for normal operation. If the DTC returns, GO to  8.
      • No  : For DTC B1A61:11, GO to  6.

        For DTC B1A61:15, GO to 3  .

  3. CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR FEEDBACK CIRCUIT FOR AN OPEN
    1. Ignition OFF.
    2. Disconnect: HVAC Module C228A.
    3. Disconnect: HVAC Module C228B.
    4. Measure:
      HVAC Module In-Vehicle Temperature and Humidity Sensor
      G08033680
      G08033677
      C228B C2247
      Pin Circuit Measurement / Action Pin Circuit
      29 VH414 (GN/BU)
      G08031553
      		 2 VH414 (GN/BU)

      Is the resistance less than 3 ohms? 

      • Yes:  GO to 4  .
      • No  : REPAIR the circuit.
  4. CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN
    1. Measure:
      HVAC Module In-Vehicle Temperature and Humidity Sensor
      G08033466
      G08033677
      C228A C2247
      Pin Circuit Measurement / Action Pin Circuit
      23 RH111 (GY/BU)
      G08031553
      		 5 RH111 (GY/BU)

      Is the resistance less than 3 ohms? 

      • Yes:  GO to 5  .
      • No  : REPAIR the circuit.
  5. CHECK THE SIGNAL RETURN CIRCUIT FOR A SHORT TO VOLTAGE
    1. Ignition ON
    2. Measure:
      In-Vehicle Temperature and Humidity Sensor Ground
      G08033677
      G08031601
      C2247 Ground
      Pin Circuit Measurement / Action Pin Circuit
      2 VH414 (GN/BU)
      G08033411
      		 - Ground

      Is any voltage present? 

      • Yes:  REPAIR the circuit.
      • No  : GO to  8.
  6. CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR FEEDBACK CIRCUIT FOR A SHORT TO THE SIGNAL RETURN CIRCUIT
    1. Ignition OFF.
    2. Disconnect: HVAC Module C228A.
    3. Disconnect: HVAC Module C228B.
    4. Measure:
      In-Vehicle Temperature and Humidity Sensor In-Vehicle Temperature and Humidity Sensor
      G08033677
      G08033677
      C2247 C2247
      Pin Circuit Measurement / Action Pin Circuit
      2 VH414 (GN/BU)
      G08031553
      		 5 RH111 (GY/BU)

      Is the resistance greater than 10, 000 ohms? 

      • Yes:  GO to 7  .
      • No  : REPAIR the circuits.
  7. CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR FEEDBACK CIRCUIT FOR A SHORT TO GROUND
    1. Measure:
      HVAC Module Ground
      G08033680
      G08031601
      C228B Ground
      Pin Circuit Measurement / Action Pin Circuit
      29 VH414 (GN/BU)
      G08031553
      		 - Ground

      Is the resistance greater than 10, 000 ohms? 

      • Yes:  GO to 8  .
      • No  : REPAIR the circuit.
  8. CHECK FOR CORRECT HVAC MODULE OPERATION
    1. Ignition OFF.
    2. Disconnect and inspect all HVAC module connectors.
    3. Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    4. Reconnect the HVAC module connectors. Make sure they seat and latch correctly.
    5. Reconnect the In-Vehicle Temperature and Humidity Sensor connector. Make sure it seats and latches correctly.
    6. Operate the system and determine if the concern is still present.

      Is the concern still present? 

      • Yes:  CHECK OASIS  for any applicable TSBs  . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs  address this concern, INSTALL a new HVAC module. REFER to Heating Ventilation Air Conditioning (HVAC) Module .
      • No  : The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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